fix chunks calc

Author: bartveneman

.github/workflows/release.yml

@@ -8,19 +8,7 @@ on:
     types: [created]
 
 jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
-        with:
-          cache: 'npm'
-          node-version: 22
-      - run: npm ci --ignore-scripts --no-audit --no-fund
-      - run: npm test
-
   publish-npm:
-    needs: test
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
@@ -30,6 +18,8 @@ jobs:
           cache: 'npm'
           registry-url: https://registry.npmjs.org/
       - run: npm ci --ignore-scripts --no-audit --no-fund
+      - run: npx playwright install chromium --only-shell
+      - run: npm test -- --forbid-only
       - run: npm run build
       - run: npm publish --public
         env:

src/index.test.ts

@@ -186,10 +186,12 @@ test.describe('from coverage data downloaded directly from the browser as JSON',
 				1, 1, 1, 1,
 				// comment + p {}
 				0, 0, 0, 0,
+				// newline
+				1,
 				// @media
 				1,
 				// h1 {
-				1, 0,
+				0,
 				// color: green; }
 				1, 1, 1,
 			]),
@@ -200,10 +202,10 @@ test.describe('from coverage data downloaded directly from the browser as JSON',
 		let result = calculate_coverage(coverage, html_parser)
 		expect(result.coverage_per_stylesheet.at(0)?.chunks).toEqual([
 			{ start_line: 1, is_covered: true, end_line: 4, total_lines: 4 },
-			{ start_line: 4, is_covered: false, end_line: 8, total_lines: 5 },
-			{ start_line: 8, is_covered: true, end_line: 10, total_lines: 3 },
-			{ start_line: 10, is_covered: false, end_line: 11, total_lines: 2 },
-			{ start_line: 11, is_covered: true, end_line: 14, total_lines: 4 },
+			{ start_line: 5, is_covered: false, end_line: 8, total_lines: 4 },
+			{ start_line: 9, is_covered: true, end_line: 10, total_lines: 2 },
+			{ start_line: 11, is_covered: false, end_line: 11, total_lines: 1 },
+			{ start_line: 12, is_covered: true, end_line: 14, total_lines: 3 },
 		])
 	})
 
@@ -223,6 +225,7 @@ test.describe('from coverage data downloaded directly from the browser as JSON',
 			],
 			html_parser,
 		)
+		expect(result.coverage_per_stylesheet.at(0)?.text).toEqual('h1 {\n\tcolor: blue;\n}')
 		expect(result.coverage_per_stylesheet.at(0)?.chunks).toEqual([
 			{
 				start_line: 1,

src/index.ts

@@ -128,20 +128,20 @@ export function calculate_coverage(coverage: Coverage[], parse_html?: Parser): C
 			{
 				start_line: 1,
 				is_covered: line_coverage[0] === 1,
-				end_line: 0,
-				total_lines: 0,
+				end_line: 1,
+				total_lines: 1,
 			},
 		]
 
-		for (let index = 0; index < line_coverage.length; index++) {
+		for (let index = 1; index < line_coverage.length; index++) {
 			let is_covered = line_coverage[index]
-			if (index > 0 && is_covered !== line_coverage[index - 1]) {
+			if (is_covered !== line_coverage[index - 1]) {
 				let last_chunk = chunks.at(-1)!
 				last_chunk.end_line = index
 				last_chunk.total_lines = index - last_chunk.start_line + 1
 
 				chunks.push({
-					start_line: index,
+					start_line: index + 1,
 					is_covered: is_covered === 1,
 					end_line: index,
 					total_lines: 0,
@@ -150,7 +150,7 @@ export function calculate_coverage(coverage: Coverage[], parse_html?: Parser): C
 		}
 
 		let last_chunk = chunks.at(-1)!
-		last_chunk.total_lines = line_coverage.length - last_chunk.start_line + 1
+		last_chunk.total_lines = line_coverage.length + 1 - last_chunk.start_line
 		last_chunk.end_line = line_coverage.length
 
 		return {